A) RAMP 1.4 assembly
“Wiring” and “Electronic” steps can be started now with the RAMP assembly (see photograph), plus different tests and set up’s including the stepper motors and their pololu (that’s the reason why the motors have not been assembled yet), the PSU and so on …
I recycle heatsinks from an old web device to mount it on the Mosfet’s; the space is quite limited and I’ll have to manually make some heatsink modifications to adapt them; As well I plan a cooling fan to blow on the electronic cards. I recall that the electronic components will be placed on the upper board of the Delta 3D printer and not in a confined space.
B) Power System Unit
Of course I need to connect my PSU first; I use a non-used electrical extension (that is new), I cut it and stripe the wires (see photograph).
I switched to change from 110V to 220V … And I met a new issue: the switch disengaged from its housing 😈 ; I’ve never connected before the PSU that remained in its packaging for several months – I noticed the warning label on the unit, but I took the decision to open it in order to recover all the components (the switch – the small blades and the housing).
I was thinking it was only a switch issue, and the brazing of the 220V end terminals the problem was fixed … actually the PSU is definitively out of order while I never connected it! 25€ have been lost consequently 😈 .
I have to ordered a new one that will be dedicated to the motors, the endstops, the LCD screen, the hotend and the cooling fans only; the heatbed will have its own power unit under 24V when the time comes. Then I need:
- 40W for the cartridge heater intended for the hotend,
- 3.1V @ 2.5A for each motor, so 7.75W for each one i.e. 31W for the 4,
- it corresponds to a minimum power of 71W,
- if we add the 5 cooling fans of 12V@0.08A ≈1W (1 for each of the 3 motors except the one for the extrudeur – 2 for the hotend), we reach a minimum of 76 W.
NB: I’ll follow the reprap tutorial to make the wiring and after to make some set up’s (before installing it on the 3D printer).
Wiring to make
C) The Heatbed
In a first step, I’m not thinking in using a heatbed: I’ll be limited to print PLA material only (at the beginning).
Regarding the printing surface and the amount of currents in play, I would like to design a specific heatbed under 24V; thus I plan to use a static relay. Two approaches are possible:
- a single heatbed with different heated areas (some ideas to limit thermal loses),
- several “modular” heatbed, with different sizes (that I choose) depending on the printing surface.
… See later ….
D) The Hotend
The hotend development will be treated in a specific blog…
E) Some photos
Thanks to Philippe who helped me, the wirings are now clean, the connectors were well made. Nevertheless a