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"GinaRep Giant Mk 4" 3D Printer

Gina

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I'm starting this Blog as I have decided to resurrect my Giant 3D Printer project sometime in the relatively near future.  From building other printers I have gained extra knowledge and may have a plan.  This will be based on both the Mk.2 and Mk.3 Giant printer designs plus my Concorde 3D Printer for the Z drive system.  The main casing has yet to be decided.  The print bed will be moving to provide the Z axis, having thought long and hard about a moving XY frame as in the Mk.2 and rejected it.  The Z drive will move the print bed as in Concorde printer with trapezoidal form threaded rods and C-Beam Linear Rail – Cut To Size with C-Beam Double Gantry Plates.



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Gina

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The print bed will be from previous Giant printers - 500mm x 500mm x 5mm aluminium plate with mains voltage silicone heater pad underneath.  I want to make this latest version of the printer capable of covering the whole of the print bed if possible.  The bed will be supported by a plywood sheet itself supported by an aluminium extrusion frame attached to the C-Beam double gantry plates.  Between bed and plywood I plan to have 12mm thick PU foam for insulation and to ensure the heater pad is touching the aluminium plate (the glue has given up in the central region).  The C-Beam will be 1000mm giving a printing height of just over 800mm.  NEMA23 stepper motors will provide the drive.

Amazingly, I have found a PEI sheet big enough for my Giant print bed :-  PrimaFil PEI Ultem sheet 500x500mm-0.2 mm  and with the pound dropping fast against the Euro I've decided to get it now.  It can go on the aluminium print bed to provide a better printing surface than plain aluminium while cutting out the glass plate will greatly reduce the weight.

Edited by Gina

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I look forward to seeing how this goes. I have a Sidewinder X1 and the AC bed is reall good.

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The lights dim when I run the mains heater on my Giant printer 🤣  Well, not quite but it is 1.2KW which is more than a bar of an electric fire. 

Having tried PEI sheet on my Concorde printer with unsatisfactory results, I'm now not sure about using it on the bed of my Giant printer.  I didn't do very well with plain aluminium for print adhesion though and unless I can adjust print settings to make plain aluminium work I shall definitely try the PEI.

Edited by Gina
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I'm no longer sure about using the C-Beam and Gantry Plate system in view of the cost mainly though if I decide to change the Z axis on the Concorde I would have most of the parts to transfer from Concorde to Giant.  The Concorde printer Z drive system does not appear to be performing as well as I had expected though I'm not sure the rail system is the cause, I have some investigations to do.

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A bed weight of several KG would be better supported on 3 threaded rods I reckon and guided with metal wheels on two 20mm x 20mm V-Slot extrusion rails.

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That's pretty much how my D-Bot is. The wheels are on diagonally opposite corners. With a heavy bed it's best to use 1mm pitch screws to avoid 'back-driving' when power is removed or z motor(s) de-energised. That's assuming 1 motor per screw. If just 1 motor with screws driven by belt/pulley arrangement then steeper screws may be ok. 

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My screws are 1mm pitch.  I plan to try with one motor and belt/pulley arrangement.

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