---
page_id: wsd-metal-fill-63c48593
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template_id: discord-page
template_version: template-0.1.0
title: "Thread: Metal Fill"
slug: wsd-metal-fill-63c48593
route: /evidence/i-information/questions/threads/metal-fill
section: reference
access: public
summary: 31 Discord messages from ℹ️ - Information/⁉️-questions/threads/metal-fill.md.
status: published
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home_href: /
md_url: /evidence/i-information/questions/threads/metal-fill.md
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/i-information/questions/threads/metal-fill.talk.md
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---

# Thread: Metal Fill

Category: **ℹ️ - Information**
Parent channel: **#⁉️-questions**
Thread ID: `1444531273728262376`

Messages: **31**

## message-1444531273728262376

**2025-11-30T03:31:33.75+00:00 — Buck (@buck_042)**

- Message ID: `1444531273728262376`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444531273728262376
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
When I use LibreLane to generate a small digital module, everything looks normal but there is no metal fill, whereas I noticed that the top design in the template does have metal fill. What is causing this difference?
```

**Attachments**

- Resolved media URL: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11_media/image-60690.png
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## message-1444535127051862158

**2025-11-30T03:46:52.454+00:00 — Marcus (@bigturtle8)**

- Message ID: `1444535127051862158`
- Author ID: `585619259888107520`
- Nickname: Marcus
- User name: bigturtle8
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444535127051862158
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
First thought would be different hardening strategies in the config.json, but could be wrong (https://librelane.readthedocs.io/en/latest/usage/caravel/index.html)
```

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## message-1444536417509183488

**2025-11-30T03:52:00.123+00:00 — Buck (@buck_042)**

- Message ID: `1444536417509183488`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444536417509183488
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
I don't know, I don't see any configuration related to metal fill in template's config.yaml. And the fillers are successfully inserted, but no metal fill.
```

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## message-1444552932862329045

**2025-11-30T04:57:37.69+00:00 — Buck (@buck_042)**

- Message ID: `1444552932862329045`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444552932862329045
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
I see, the template uses the chip flow, which calls some KLayout scripts to insert metal fill. In my case, I didn’t explicitly set any flow, so I assume it’s using the default classic flow, which doesn’t seem to run the KLayout density/metal-fill steps.

If I want to add metal fill for a small standalone digital block, what is the recommended approach?
```

**Attachments**

- Resolved media URL: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11_media/image-81663.png
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## message-1444592695732473906

**2025-11-30T07:35:37.897+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1444592695732473906`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444592695732473906
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
Normally, you wouldn't run metal fill for a standalone block.

One way to do that, however, is to add the `KLayout.Filler` step after one the StreamOut steps in the Classic flow. You can do this directly in the config.
```

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## message-1444596035371532418

**2025-11-30T07:48:54.129+00:00 — Buck (@buck_042)**

- Message ID: `1444596035371532418`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444596035371532418
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
Thanks! May I ask how to do that directly in the config?
```

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## message-1444623255473230096

**2025-11-30T09:37:03.907+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1444623255473230096`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444623255473230096
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
You can find the relevant docs here: https://librelane.readthedocs.io/en/latest/usage/writing_custom_flows.html
By using `substituting_steps` and placing a "+" before the step ID. You're welcome!
```

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## message-1444741493037203487

**2025-11-30T17:26:53.939+00:00 — Buck (@buck_042)**

- Message ID: `1444741493037203487`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444741493037203487
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-11/2025-11.json

**Content**

```text
Thank you!
```

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## message-1444923623063162992

**2025-12-01T05:30:37.121+00:00 — Buck (@buck_042)**

- Message ID: `1444923623063162992`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444923623063162992
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
@Leo Moser (mole99) Hi mole99, may I ask a further question?  Can I ask why only this much metal is filled here? It seems the density requirement is still not met. Is this normal? Thank you very much!
```

**Attachments**

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## message-1444932627403640873

**2025-12-01T06:06:23.923+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1444932627403640873`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444932627403640873
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
The filler generation script was made to fill an entire chip, so it adheres to rules such as leaving a 26um spacing from the edges to meet the 10um distance to the sealring etc.
I assume this is what leads to what we see here.
```

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## message-1444938557826531413

**2025-12-01T06:29:57.846+00:00 — Buck (@buck_042)**

- Message ID: `1444938557826531413`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
I see, thanks! I think this works. We do this because we will integrate this module to our analog module.
```

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## message-1444943456861556796

**2025-12-01T06:49:25.867+00:00 — Buck (@buck_042)**

- Message ID: `1444943456861556796`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1444943456861556796
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
Oh I see, actually we don't need fill the digital module at this stage, like we can fill all during the top level?
```

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## message-1444954697034371073

**2025-12-01T07:34:05.733+00:00 — Leo Moser (mole99) (@mole99)**

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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

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**Content**

````text
Yes, that is the usual approach. The fill for the entire chip is added at the end.

If you do an analog top-level integration you can add the fill manually:

```
klayout -b -zz -r ${PDK_ROOT}/${PDK}/libs.tech/klayout/tech/drc/filler_generation/fill_all.rb -rd input=chip_top.gds -rd output=chip_top_filled.gds
```
````

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---

## message-1445070331613282518

**2025-12-01T15:13:35.165+00:00 — Buck (@buck_042)**

- Message ID: `1445070331613282518`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445070331613282518
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1444531273728262376/1444954697034371073
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```text
Hi Leo, thank you! If we want to do top-level integration, may I ask how to obtain a clean pad ring without any logic cells? My current idea is to follow the template, remove everything in the Verilog except VDD/VSS and the pad instances, and remove the metal fill step in the flow, and then rerun the synthesis and PnR flow. Is this the correct approach?
```

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---

## message-1445071219425546413

**2025-12-01T15:17:06.836+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445071219425546413`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445071219425546413
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

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**Content**

```text
There is an easier approach :)
You customize the flow to only generate the padring + sealring and then streamout the GDS. I already did this for the MOSbius group: https://github.com/wafer-space/gf180mcu-project-template/pull/29
```

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---

## message-1445073706736029870

**2025-12-01T15:26:59.857+00:00 — Buck (@buck_042)**

- Message ID: `1445073706736029870`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445073706736029870
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1444531273728262376/1445071219425546413
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```text
Thank you, this is very helpful! So with this, can we still configure our IO plan? Like, by changing the pad instances in Verilog and the IO placement inside the config.yaml.
```

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---

## message-1445074364893495347

**2025-12-01T15:29:36.774+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445074364893495347`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445074364893495347
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
Yes, it still uses the LibreLane configuration. It simply rearranges the flow slightly.
```

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---

## message-1445074513514725437

**2025-12-01T15:30:12.208+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445074513514725437`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445074513514725437
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

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```text
There were XOR errors between magic and KLayout (?) but I haven't had the time to look into it. Maybe you could see what the difference between the two layouts is.
```

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---

## message-1445075481916473525

**2025-12-01T15:34:03.093+00:00 — Buck (@buck_042)**

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- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445075481916473525
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**Content**

```text
Thank you, this is helpful!
```

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---

## message-1445076061003059221

**2025-12-01T15:36:21.158+00:00 — Buck (@buck_042)**

- Message ID: `1445076061003059221`
- Author ID: `839883081896689765`
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- User name: buck_042
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

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I will try to do that. But to be honest, we are trying to catch up with the DDL now. 😂  See what we can help. Really thank you, Leo!
```

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---

## message-1445076397491224620

**2025-12-01T15:37:41.383+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445076397491224620`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445076397491224620
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
Yes, just make sure to use the correct layout then if there is a difference between magic and KLayout 😁
No worries! Looking forward to your design.
```

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---

## message-1445177037902970930

**2025-12-01T22:17:35.927+00:00 — Evansika (@xintingjiang_36756)**

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- Author ID: `1413605821430104114`
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- User name: xintingjiang_36756
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I also encountered this when generating the empty pad frame today. Now I am looking into the differences between the two layouts
```

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---

## message-1445183613833576509

**2025-12-01T22:43:43.751+00:00 — Evansika (@xintingjiang_36756)**

- Message ID: `1445183613833576509`
- Author ID: `1413605821430104114`
- Nickname: Evansika
- User name: xintingjiang_36756
- Type: `Default`
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**Content**

```text
In my case, klayout gds is correct because I found that the only mismatch is that the magic gds has these extract tieh and tiel cells at the origin and I don't know why
```

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---

## message-1445317188952260709

**2025-12-02T07:34:30.541+00:00 — Leo Moser (mole99) (@mole99)**

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- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445317188952260709
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
Right, that's the difference! It seems that magic exports the instances even if they were not placed. There are some constants that are used in `chip_top`, but we stream out the padring before any of those stdcells can be placed and routed.
So the KLayout version is the correct one to use.
```

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---

## message-1445798440511733761

**2025-12-03T15:26:49.854+00:00 — Buck (@buck_042)**

- Message ID: `1445798440511733761`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445798440511733761
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1444531273728262376/1444954697034371073
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**Content**

```text
Hi Leo, may I ask a question? We are doing analog top-level integration now, so after we connect our design to the pad ring, is this the last step before DRC and LVS? Or any other step we should run? Thank you!
```

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---

## message-1445799020521066628

**2025-12-03T15:29:08.139+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445799020521066628`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445799020521066628
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1444531273728262376/1445798440511733761
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**Content**

```text
Hi Buck, sure thing. You should also generate the fill before doing DRC and LVS, but other than that, that should be it.
```

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---

## message-1445799414202503268

**2025-12-03T15:30:42+00:00 — Buck (@buck_042)**

- Message ID: `1445799414202503268`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1445799414202503268
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1444531273728262376/1445799020521066628
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Thanks!
```

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---

## message-1447774602863448105

**2025-12-09T02:19:23.674+00:00 — Buck (@buck_042)**

- Message ID: `1447774602863448105`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1447774602863448105
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
@Leo Moser (mole99) Hi Leo, sorry to bother you again, after we do the top level analog style integration and do the fill step, is there any script or command that we can use to tun the drc check in librelane environment? Before we used chipathon environment. Thanks!
```

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---

## message-1447835974397591605

**2025-12-09T06:23:15.788+00:00 — tnt (@246tnt)**

- Message ID: `1447835974397591605`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1447835974397591605
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/metal-fill/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
If you run the pre-check, it will run DRC.
```

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---

## message-1447851345557061686

**2025-12-09T07:24:20.558+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1447851345557061686`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1447851345557061686
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/metal-fill/2025-12/2025-12.json

**Content**

```text
As Sylvain said, you can run the precheck.
This can be done either through the online platform (https://platform.wafer.space/) or locally (https://github.com/wafer-space/gf180mcu-precheck).
Alternatively, you can run the DRC deck directly: https://github.com/wafer-space/gf180mcu/blob/main/gf180mcuD/libs.tech/klayout/tech/drc/gf180mcu.drc
```

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---

## message-1448027290272530514

**2025-12-09T19:03:29.047+00:00 — Buck (@buck_042)**

- Message ID: `1448027290272530514`
- Author ID: `839883081896689765`
- Nickname: Buck
- User name: buck_042
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444531273728262376/1448027290272530514
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**Content**

```text
Thanks!
```

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