# Ultimate Altmill Building Issues

**URL:** <https://forum.sienci.com/t/ultimate-altmill-building-issues/26236>\
**Category:** 💨 Dust\
**Created:** [April 22, 2026, 9:21pm UTC](https://forum.sienci.com/t/ultimate-altmill-building-issues/26236 "2026-04-22T21:21:34Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![acruther](https://forum.sienci.com/user_avatar/forum.sienci.com/acruther/32/11262_2.png) [@acruther](https://forum.sienci.com/u/acruther)\
**Post date:** [April 22, 2026, 9:21pm UTC](https://forum.sienci.com/t/ultimate-altmill-building-issues/26236/1 "2026-04-22T21:21:34Z")

</div>

So I’m constructing the Ultimate Altmill based on the Sienci files but I’m finding my face boards don’t match the profiles of the legs. Specifically, the angles seem to be off.

- Did anyone else have these issues?
- Did Sienci change the profile of their legs?
- Does anyone have corrected dimensions that work? Fortunately it’s look these are too wide so I haven’t wasted wood…

 ![IMG_6804](https://forum.sienci.com/uploads/default/original/2X/b/b2f91e2ff80f4f6236f763a9da1dc8531cda8ab0.jpeg)

 ![IMG_6806](https://forum.sienci.com/uploads/default/original/2X/5/53b7fc63e35cd3a6054737fbf36b15877ce65f8c.jpeg)

 ![IMG_6805](https://forum.sienci.com/uploads/default/original/2X/4/4485a6a41df1a4cb22ebefeb74f0ffc901258f2d.jpeg)

---

<div class="post-metadata">

**Author:** ![DavidB](https://forum.sienci.com/letter_avatar_proxy/v4/letter/d/76d3ee/32.png) [@DavidB](https://forum.sienci.com/u/DavidB)\
**Post date:** [April 22, 2026, 9:47pm UTC](https://forum.sienci.com/t/ultimate-altmill-building-issues/26236/2 "2026-04-22T21:47:46Z")

</div>

I believe you are referring to this? [Altmill leg stiffeners - #4 by Chucky\_ott](https://forum.sienci.com/t/altmill-leg-stiffeners/17746/4)

---

<div class="post-metadata">

**Author:** ![Chucky\_ott](https://forum.sienci.com/user_avatar/forum.sienci.com/chucky_ott/32/8692_2.png) [@Chucky\_ott](https://forum.sienci.com/u/Chucky_ott)\
**Post date:** [April 22, 2026, 9:53pm UTC](https://forum.sienci.com/t/ultimate-altmill-building-issues/26236/3 "2026-04-22T21:53:14Z")

</div>

@acruther @DavidB Yup. The angle on the legs changed from mk1 to mk2. Both versions should now be available from the Onshape files.

You could probably use your existing cutouts for the new profile. Luckily, you need to remove material and not add.

Mk2 legs:

> [@Ultimate Altmill Drawer Cabinet](https://forum.sienci.com/t/ultimate-altmill-drawer-cabinet/25568/15):
>
> @gremlin Pretty sure this is correct for the front and back. The spacing at the side is different. When I did my plywood stiffeners, I used the drawings. When I went to install them, I noticed a gap between the leg and the plywood at the bottom. Tthis meant the drawings were wrong or the legs weren’t perfectly perpendicular to the table. It turns out it was the legs that were not perpendicular. There’s a lot of racking force at the connectors so it doesn’t take much movement for the leg…

I believe the current version has more holes for mounting the power supply. Those holes aren’t shown in the drawing I linked to.

---

<div class="post-metadata">

**Author:** ![acruther](https://forum.sienci.com/user_avatar/forum.sienci.com/acruther/32/11262_2.png) [@acruther](https://forum.sienci.com/u/acruther)\
**Post date:** [April 22, 2026, 10:38pm UTC](https://forum.sienci.com/t/ultimate-altmill-building-issues/26236/4 "2026-04-22T22:38:33Z")

</div>

You are quite right. I actually went back to the OnShape doc and figured this out. Thank you for confirming.

The Sienci files need to be updated…

 ![IMG_6807](https://forum.sienci.com/uploads/default/original/2X/c/cec57e7c31a6b0cfaf784ba30dbbd256fbc2bfbc.jpeg)

 ![IMG_6808](https://forum.sienci.com/uploads/default/original/2X/6/6f7d405d0fdc3604cb2c5c8223dd4c06d5c1db05.jpeg)

Perfect fit!