- RepRap Calculator v2
- MendelMax RepRap Calculator
- Budaschnozzle - LulzBot
- Derivative of Greg's Wade Extruder
- TechPaladin Printing
- MendelMax Trinity Labs
- Panucatt Devices - Combined RAMPS and Arduino Mega into one package and amazing Helios 12V heatbed.
- UltiMachine - RepRap hardware and electronics
- Terawatt Industries - Terawatt Industries designs and manufactures open-source 3D printers
- Maker’s Tool Works - MendelMax store
- EckerTech - Canadian RepRap store
- Ultibots - Florida based RepRap store
- Pololu Robotics and Electronics - A4988 stepper motor driver carrier and stepper motors.
- Electronix Express
- McMaster-Carr - Mechanical, electrical, and utility hardware.
- SDP/SI - Stock Drive Products/Sterling Instrument - High quality precision parts and assemblies (timing belts, pulleys, sprockets, couplings, universal joints, fasteners, gearmotors, sintered bearings, precision ball bearings, precision gears, etc.)
- MiSUMi USA - Fixed components for the factory automation, press die, plastic mold. Supplier of aluminum extrusions used for MendelMax.
- 80/20 - Supplier of aluminum extrusions. They have Amazon store.
- Fastenal - Mechanical, electrical, and utility hardware. Supplier of aluminum extrusions.
- MendelMax list of alternate extrusions suppliers
- igus - Plastic bushings, linear bearings, self-aligning bearings, linear guides, etc.
- VXB - Ball bearings.
- netfabb Cloud Service - Web based file processing - analyze, check and repair your STLs.
- MendelMax Build - TechPaladin
- KitBOM - Open-source projects hardware bill-of-materials (BOMs).
- MakerSlide - Open Source Linear Bearing System - Open Source Linear Bearing System
- Build Log - Open source equivalent of the research notebook. It can be used to document the progress of a project, or collaborate with others.
- Inventables - Inventables is the hardware store for DIY manufacturing, selling all kinds of materials in small quantities for purchase with a credit card.