DaveAB

I have been testing it and have experienced no problems with skipping. The teeth are pretty beefy, they are designed to match the belt exactly. Using the website from DonInReno Stock 11mm pully gives you a gear ratio of: 1 : 2.9 3D printed 7mm pully gives you a gear ratio of: 1 : 3.8

Here is a photo of all 3 gears 11, 10 and 8

Sailrite actually sell a 10tooth version https://www.sailrite.com/10-Tooth-Cogged-Motor-Pulley-for-Ultrafeed The 3d printed one is 8 tooth so 20% smaller. I can't find an aluminium one.

8mm

ahh cool site, I will play around with it. I was thinking about changing the intermediate speed reducer but my cad skills were non existent until yesterday.

Why can't we just switch the pinion gear on the standard motor for a smaller one? We can! I talked to sailrite the v1 and v2 ultrafeed's came with 11 tooth cog the v3 had a 10 tooth (you can still order this on their site) they couldn't source anything with less teeth. I can't find one to buy either. You can print one though! here is an 8 tooth version, this will improve low end speed at the expense of the high speed. https://www.thingiverse.com/thing:5887617

yeah I knew the thread was old., it was the closest thing I could find that was relevant. I was trying to find someone else who has reduced the pinon size on the motor but I can't. 10 tooth cogged pulley is discontinued but they still have stock. I am just trying to figure out why reducing the size of the pinon gear isn't a good option, It seems to do exactly what a lot of people want, which is improvement of low speed at the expense of high/fast speed. the XL 8T cog can be 3d printed from here, you do need to make the shaft a bit larger (8mm). https://www.thingiverse.com/thing:16627

Why don't you just reduce the XL Drive Pulley cog count on the motor? Sailrite actually sell a 10 toothed version. This reduces the top end speed but gives you better low end range. There is an 8 toothed on here you can 3D print. It works as expected, much slower but with the same power. Its a bit nosier as the motor is spinning faster at the lower speeds. https://www.thingiverse.com/thing:16627 I am just wondering why no one seems to mention this option.