Linear Bearings

• LM12 = 12mm bearings
• LM25 = 25mm bearings

• LMB8 = 1/2" bearings
• LMB16 = 1" bearings

Manufacturing

RJ4Jp - iglidur by Igus - here is what it's made of:

• POM ( polyoxymethylene ) is the same as Acetal - [1]. $30 on Aliexpress - [2]
• POM printed bearings on Ultimaker - [3]
• Download - [4]. 3 grams each, so $30 roll of filament means 10 cents per bearing. It would be worth to print these effectively to reduce costs of building 3D printers.
• PA66 is nylon 66. [5]

RJMP 8 mm vs RJ4JP

Hint: Make sure you have the correct version - ODs are different

• RJMP has 16 mm OD - [6]. OSE carriages are 17 mm diameter, so this can fit with heat gun.
• RJ4JP - has 15 mm OD - [7]. 8x15x24.