# Longmill MK2 3Kw Bt30 ATC Magazine design (WIP) **URL:** \ **Category:** 🪑 Projects\ **Created:** [May 23, 2026, 3:17pm UTC](https://forum.sienci.com/t/longmill-mk2-3kw-bt30-atc-magazine-design-wip/26449 "2026-05-23T15:17:19Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![V-Amp\_Customs\_LLC](https://forum.sienci.com/user_avatar/forum.sienci.com/v-amp_customs_llc/32/7612_2.png) [@V-Amp\_Customs\_LLC](https://forum.sienci.com/u/V-Amp_Customs_LLC)\ **Post date:** [May 23, 2026, 3:17pm UTC](https://forum.sienci.com/t/longmill-mk2-3kw-bt30-atc-magazine-design-wip/26449/1 "2026-05-23T15:17:19Z")
After a long laundry list of health issues I will spare everyone the details of, I have returned. Just here to share a Project I’ve been working on for the Longmill Mk2. After the Auto dust shoe project I was wondering, What else can be driven with a stepper with the SLB Controller? After what felt like a $2-3K shopping spree, I later ended up with a 100mm Diameter BT30 3KW atc spindle w/ 10x ER32-70mm tool holders and set forth on designing a Concept for a BT30 tool magazine. ![20251203_221803](https://forum.sienci.com/uploads/default/original/2X/3/31248dd1b645274dd0135745e2d0ac6ce8c38ecb.jpeg) ![20251203_221755](https://forum.sienci.com/uploads/default/original/2X/c/ce35e73665720fa810ca4b241adc85c87949ae7a.jpeg) I wanted it to be mostly 3d printed for ease of proto-typing (because I the rest of the bits and bobs were expensive enough already) and so that maybe other people can try and replicate for their longmill once its ready. Good thing I can print rather quickly thanks to owning multiple printers… ![20260507_235623](https://forum.sienci.com/uploads/default/original/2X/8/88f48398979936cae76a10d5ee0620575c2fe36d.jpeg) This one has been in the works for about a year so far and Im getting close to a first proto type. Here is the progress on the model so far: ![ATC mag](https://forum.sienci.com/uploads/default/original/2X/f/f6f1007a86ce3a380077f49911e869bb5c7a3f61.gif) ![Screenshot 2026-05-23 110619](https://forum.sienci.com/uploads/default/original/2X/2/2e4def175040959180fa42447c1cafa894d7e074.jpeg) ![Screenshot 2026-05-23 110754](https://forum.sienci.com/uploads/default/original/2X/f/f9d5f6df197e69b418e905e4b9cf32b35271dab0.jpeg) I will keep posting about this in free time so thank you if anyone took the time to view this and I hope everyone has a great long memorial day weekend! Update #1: I have a completed 15 slot BT30-ER32 ATC magazine printed out. Total print time for this Mag was around 1 day per segment (seen in Black CF-PETG). With 4 printers running all at once what would have taken 5 days only took 2 days. The linkages (seen in Red PETG) took around 1.5 hrs for a single unit. The prints for the Black CF-PETG from Sunlu are printed with 20% infill and will be strong enough for this use case. The Prints in Red PETG are printed solid 100% infill. ![20260531_171340 2](https://forum.sienci.com/uploads/default/original/2X/5/55ba71652dc4d0d9ef21c7670be77c9d1b319341.jpeg) For the bottom part that accepts the NEMA-23 motor and Linear Guide rod mounting Beam this was a semi structural part so I printed each segment in black CF-PETG with 75% infill and again the Red PETG linkages were 100% infill. ![20260531_171507](https://forum.sienci.com/uploads/default/original/2X/b/bc0c26d73b09cee690c50cf40f2d5b981b8afc9b.jpeg) Next update will hopefully be soon as Im waiting on an amazon order for the T8 leadscrew, Linear guide bearings and Rods, and I should have the rest of the parts printed by the end of this week. Stay tuned and keep Machining everyone! ---
**Author:** ![Jens](https://forum.sienci.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@Jens](https://forum.sienci.com/u/Jens)\ **Post date:** [May 23, 2026, 5:16pm UTC](https://forum.sienci.com/t/longmill-mk2-3kw-bt30-atc-magazine-design-wip/26449/2 "2026-05-23T17:16:23Z")
Cool concept to have the magazine drop below the spoil board and out of the way. I would suspect that you will need two steppers to make sure the magazine stays straight and doesn’t bind anywhere. Good luck with your project! ---
**Author:** ![V-Amp\_Customs\_LLC](https://forum.sienci.com/user_avatar/forum.sienci.com/v-amp_customs_llc/32/7612_2.png) [@V-Amp\_Customs\_LLC](https://forum.sienci.com/u/V-Amp_Customs_LLC)\ **Post date:** [May 31, 2026, 9:45pm UTC](https://forum.sienci.com/t/longmill-mk2-3kw-bt30-atc-magazine-design-wip/26449/3 "2026-05-31T21:45:00Z")
Yes with out any support along the Magazine there would be issues with binding. I included 2x 10mm linear guide rods in the model that ride on 2x linear Ball bearings and should prevent any potential for binding or misalignment in normal use.