From 02d8d1a35e91783606eadcbfd1b31f249959c2ee Mon Sep 17 00:00:00 2001 From: Zruncho Date: Wed, 16 Feb 2022 22:05:24 -0800 Subject: [PATCH] A liiiiiiittle more than 450mm is needed for each belt Bump to 500mm to be sure though. --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 35f6790..3b74695 100644 --- a/README.md +++ b/README.md @@ -164,7 +164,7 @@ This BOM preview is for Alpha-4, though there's no expectation that these parts | Fasteners | M3 BHCS (various) | Yes | For Z idlers (vertical), Z idler attachments (horizontal), motor mounts, skirts, +lots more | Fasteners | M3 nuts | Yes | | Fasteners | M3 heatset inserts | Yes | For motors, bed mounts (2 + 3), motor skirts (4x3), z belt attachment (4) and more -| Z Drives | GT2 belt | 3x~450mm | +| Z Drives | GT2 belt | 3x~500mm | | Z Drives | GT2 16t pulleys | 3 | | Z Drives | MGN7H 150mm | 2 | Ideally upgrade to MGN9C on the X carriage and then get only one of these to repurpose for a front Z drive. See the nte below. | Z Drives | NEMA14 or NEMA17 motors | 3 | Needs to have enough hold torque. Mid-size (33mm body length) NEMA14 are marginal, while long (48mm body length) NEMA14 or most mid-to-large NEMA17 will provide enough unpowered hold torque to keep the bed from dropping. Ideally 0.9mm for extra resolution. Mix and match should be fine. Use what you've got. The Z drive motors barely matter.