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Bear Frame Upgrade 2.1

Y idler for 9mm belts

Introduction

This is a Y idler for 9mm wide Gates 2GT belt (standard is 6mm). Larger belts will have less flex and might reduce ringing.

Y idler for 9mm 2GT belt

Bill of Materials

Part Quantity Detail
E3D Gates 2GT 9mm Belt 1 E3D store link
E3D Gates 2GT Toothed Idler
9mm Belt, 20 Tooth, 5mm bore		 1 E3D store link
2GT Pulley 16T, 5mm bore 1 Aliexpress Powge store
Dowel pin
diameter: 4.90-4.95mm
length: 20mm		 1 Must fit the 2GT idler bearing.
📌 Cut a M5 screw if you can't find one
M3x30mm socket head screw ISO 4762 1
M3x25mm socket head screw ISO 4762 1
M3 Hex nylock nuts (DIN 985) 2
M3 steel washer DIN 125, 0.5mm thick 1

Printed parts

📌 If you have any doubt as to which Bear frame you have, please check the Bear FAQ here.

⚠️ Warning: It is important to follow the recommended print settings and to calibrate your extrusion multiplier before printing the parts (for each and every spool that you use). Check our calibration guide here.

Part Qty Note Download link
y_belt_holder_9mm_belt_bear2.0_mk2s-2.5-2.5s 1 ⚠️ For Bear 2.0 MK2(S), MK2.5(S) frame y_belt_holder_9mm_belt_bear2.0_mk2s-2.5-2.5s.stl
y_belt_holder_9mm_belt_bear2.1_mk2s-2.5-2.5s 1 ⚠️ For Bear 2.1 MK2(S), MK2.5(S) frame y_belt_holder_9mm_belt_bear2.1_mk2s-2.5-2.5s.stl
y_belt_holder_9mm_belt_bear2.1_mk3-3s 1 ⚠️ For Bear 2.1 MK3(S) frame y_belt_holder_9mm_belt_bear2.1_mk3-3s.stl
y_idler_mount_9mm_belt 1 y_idler_mount_9mm_belt.stl
y_idler_tensioner_9mm_belt 1 y_idler_tensioner_9mm_belt.stl

The Y motor mount from the standard Bear Frame 2.1 printed parts is reused.

Print settings

⚠️ Warning: It is important to follow the recommended print settings and to calibrate your extrusion multiplier before printing the parts (for each and every spool that you use). Check our calibration guide here.

  • Slicer : PrusaSlicer recommended
  • Infill type : Gyroid recommended
  • Support : No
  • Brim : No
  • Detect thin walls : No
  • Perimeters width (internal and external) : 0.45mm
Part Layer
Height
[mm]		 Infill [%] Num.
Perimeters		 Num.
Top/Bottom
Layers
y_belt_holder_9mm_belt_X 0.20 20 4 5
y_idler_mount_9mm_belt 0.20 20 4 5
y_idler_tensioner_9mm_belt 0.20 20 4 5

Assembly instructions

Follow the same assembly instructions as for the standard Bear 2.1 Y idler.