Only 6 left and in 2 carts

Price:$20.00+

Loading

12mm/15mm Pulley + Belt - Upgrade for OSSM or 8mm motor shaft | Curated Hardware Kit

Arrives soon! Get it by Jun 2-10 if you order today
Jun 2-10

Returns & exchanges accepted

Please select an option

Please select an option

You can only make an offer when buying a single item

Reviews for this item

4.5

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience.

(4 reviews)

5.0 Item quality
5.0 Shipping
5.0 Customer service
67% Buyers recommend
Loading
5 out of 5 stars 5 This item

TheOnly May 9, 2026

Another great upgrade from armpitMFG. Great customer service and high quality ppart.

TheOnly May 9, 2026

5 out of 5 stars 5 This item

K Jan 22, 2026

Very nice upgrade I went with the 15mm and modified my machine to make it fit, if you’re not comfortable modifying your stock machine go with the 12mm like they say in the product description.

K Jan 22, 2026

5 out of 5 stars 5 This item

Cloin Nov 2, 2025

Easy enough to install and is a welcome upgrade for heavier end effectors

Cloin Nov 2, 2025

3 out of 5 stars 3 This item

Darren Mar 6, 2026

The wider belt made my slipping problem worse, but that helped me see the real issue which is that the belt goes sideways on the roller bearings which causes the belt to lift up on one side at the pulley. I've found some proper guide pulleys on ali which should fit and keep the belt in line. Hopefully that will fix it but will only fit the 10mm belt. They had some which will fit a 12mm belt but would be too wide for the enclosure. If you're having belt slip issues have a look into that before throwing a wider belt at it.

Darren Mar 6, 2026

Response from Burns

Hey Darren, the 15mm setup you got requires manual modifications to the Actuator Body, as mentioned in the listing. You need to filing down plastic near the bearings in 4 spots to align the wider belt properly, otherwise even though you're using the wider belt it will actually reduce the amount of grip because the belt will bind on the edges. Please feel free to message me, would like to refund or help you get the wider belt working on your setup! -Burns

armpitMFG
armpitMFG ·

North Charleston, South Carolina

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience. 5.0
·
599 sales
·
1.5 years on Etsy
2 shop members

Typically responds within a few hours

Typically responds within a few hours

Speedy replies Has a history of replying to messages quickly.

Rave reviews Average review rating is 4.8 or higher.

You may also like

Disclaimer: Etsy assumes no responsibility for the accuracy, labeling, or content of sellers' listings and products. Electrical or electronic products may pose a risk of fire or electrocution. Vintage, handmade, refurbished, or modified electrical or electronic products may not meet current safety standards and may not be in safe working order. Inspect carefully before use and message the seller if you have concerns relating to the product. Do not use a vintage electrical or electronic item if its safety cannot be verified. To reduce the risk of fire, never leave vintage electrical or electronic products plugged in unattended. See Etsy's Terms of Use for more information.