Joshendy's Blog | CNC, 3D Printer, Robotics and Programming projects. Rostock Base. Drew's Rostock: the print head. For my printer's hot end I chose a Mini J-head Mk II, custom-made by hotends.com. The standard J-head is designed for 3mm filament. I liked the simplicity and light weight of the J-head, but my printer is intended to use 1.75mm filament, so I custom-ordered a mini J-head instead. I had been considering an Arcol.hu hot end at first - liked the idea of an all-steel extruder - or possibly a Budaschnozzle, but the Rostock design really calls for a head that's as lightweigt as practical to make full use of the platform. I won't be able to print the more challenging materials like teflon with this nozzle, but that's not really my aim anyway.
The J-head, like most hot ends, seems to be designed to mount into a slot in a wooden base plate. Presumably the wood helps insulate the hot end from the plastic structure around it, and is itself sufficiently temperature-resistant to not be damaged by the hot end. Here I've wrapped insulating wool and Kapton tape around the heater block. Billy D's Rostock 3D Printer. Rostock - Car Boot RepRap. Concept for a delta robot 3D printer Design goals - Build volume: 8x8x16 inches or 200x200x400 mm - Footprint: 12x12 inches - Print surface: 8x8 inches heated glass which never moves - Mass of moving platform with hotend: less than 100 g - Mass of moving platform with two hotends: less than 150g - Positioning speed: 800 mm/s in all 3 directions - Positioning accuracy: 100 steps/mm in all 3 directions - Simplicity: fewer than 200 parts (not including washers, nuts and SMD-mounted electronics) - Hardware cost: less than $500 USD Parts - Stepper motors: 4x NEMA 17 (plus extruder motors) - Timing belt: High-torque GT2 belt (2 mm pitch) - Pulleys: 12 groove aluminum (7.6 mm pitch diameter) - Filament drive(s): similar to Ultimaker - Ball bearings: 8x 608 (skateboard bearings) - Linear bearings: 8x LM8UU - Smooth rod: 8x 762x8 mm - Diagonal rods: hollow carbon fiber rods from kite shop - Diagonal rod ends: cheap ball joints used for model race cars - Hotend(s): MakerGear 1.75 mm Inspiration Ancestors.
Rostock.