RepRap Mendel

RepRap Mendel Basic Data Category: 3D printer URL (first publication): https://reprap.org/wiki/Mendel Project status: Technical documentation Maturity of the project: no no no Other Assembly instructions are editable: Bill of materials is editable: Design files are in original format: No Free redistribution is allowed licence: No Project management Open-o-meter: 0 Product category: Electronics Contains original non-electronic hardware: Contains original electronic hardware: Contains original software:

Description

Mendel

From RepRap

The machine on the right is the RepRap printer, which we call "Mendel" after the . It's the second, improved version of RepRap: small enough to fit on your desk, but with a print volume large enough for you to make big things (see ). The machine is made up of bits bought in from local suppliers or online, and parts which it can make for itself - all the translucent structural components you can see.

In the picture, behind the machine, you can see the RepRap software which you can use to print . We give this, and the designs for the machine away, free - it's all ( 2). Though you do have to buy in some standard components from well, whoever you want which cost about €400. The idea of getting all the materials and building a machine yourself may seem daunting, but this area of the wiki is dedicated to making the whole process as easy as possible.

There are a number of instructional videos distributed through the Mendel documentation. These are also all .

You can see examples of people's Mendels, and where they got their parts at .

Mendel Specifications

The table below outlines the specifications of the machine.

	Metric	US imperial
Manufacturer	RepRap (or anyone who wants )
Model	Mendel
Technology	FFF (Fused Filament Fabrication)/Thermoplastic extrusion
Price of all materials
Annual Service Cost	Occasional oiling = €5. It can print its own replacement printed parts at material cost.	Occasional oiling = $8. It can print its own replacement printed parts at material cost.
Size	500 mm (W) x 400 mm (D) x 360 mm (H)	20” (W) x 16” (D) x 14” (H)
Weight	7.0 kg	15.5 pounds
Build Envelope	200 mm (W) x 200 mm (D) x 140 mm (H)	8” (W) x 8” (D) x 5.5” (H)
Materials	, HDPE, & more. Uses ø 3 mm filament.	, HDPE, & more. Uses ø 1/8” filament.
Material Cost	: €22/kg, HDPE: €11/kg, : €17/kg	: $14/lb, HDPE: $7/lb, : $10/lb
Speed	15.0 cm3 per hour solid (test done for , similar for others)	0.92 inch3 per hour solid (test done for , similar for others)
Accuracy	Diameter of nozzle 0.5 mm, 2 mm min. feature size, 0.1 mm positioning accuracy, layer thickness 0.3 mm	Diameter of nozzle 0.020”, 0.080” min. feature size, 0.004" positioning accuracy, layer thickness 0.012”
Finish	Fair
Volume of printed parts to replicate	1110 cm3	67.7 inches3

(With the standard infill settings the 15.0 cm3 per hour solid extrusion rate is equivalent to a built volume rate of 19.0 cm3 per hour.)

Mendel vs. Darwin

Mendel is the latest generation RepRap machine. Mendel supersedes the first version, which we call Darwin.

Ed Sells, a student of Dr. Adrian Bowyer, designed and built the first Mendel printer, sometimes called a "Sells Mendel" to distinguish the original design from later tweaks. It has the following key improvements over Darwin:

• Improved constraint on the z-axis to eliminate jamming
• Better axis efficiency
• Simpler assembly
• Capacity for tool changing (to follow very shortly)
• Lighter and more portable

This video illustrates these improvements:

For a numerical comparison .

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