3D Printing

2015 - 03.07

printing pla on gluestick

   If you want a fun new hobby or looking to extend your engineering capability’s pickup a davinci 1.0 off ebay or newegg.ca for 400 usd shipped to your door in 3 days or spend more and get one with dual extruders (both supported in repetier firmware), spend a week learning to print with different materials on different materials.

   First off you will need to figure out how to flash your davinci. it uses the bossa atmel transfer protocol  for sending the firmware ive herd of people flashing them without rebooting them but i’ve yet to do that.

i ended up installing a switch above the usb connector because im going to be reflashing this beast alot and its kindof awkward to get at. after cutting a hole out with a butane soldering iron with a knife tip with the sd card and had a hole cutout anyway but you need to jumper the back then shut it off only boot up the davinci just before the arduino ide goes to upload the flash to get a proper upload. 800x600-IMG_0249

  1. http://www.thingiverse.com/thing:623274   one of these put a peice of blue kapton tape on the bottom of it to isolate the hotend part
  2. http://www.thingiverse.com/thing:592197 << filament guide and back corner bracket, mine were printed in abs and still worked well.
  3. spool rollers
  4. gluestick holder as something easy to print as your first PLA print on glue to make life easy and rewarding for getting this far. you’ll probable end up with a couple of these lol so you can use them to hold brushes and the scraper
  5. (optional)print a cardtridge clip(not designed yet) to gain access to the voltage and io pins for extra functionality programmed into the firmware if you feel adventerous.

 

Printrun and cura to do all the slicing and dicing so next was to fab up some quick easy abs parts a spool holder. new fan shrowd with a bottom covering the , put the pla spool inside the unit, put some gluestick down and printed

 

desktop-printruncura

http://www.thingiverse.com/thing:722204 settings for cura — cura profiles for loading stl files and exporting proper sliced gcode ,   after the first layer frints good turn the hotbed off the prints stick great for the whole print.

 

zombie fan cooler

fan for cooling prints, i havent needed this yet thankfully but i will when it comes time to do bridging(printing midair)

 

  • repetier 0.92 – version seems to work well (specialized for davinci printers)
  • waiting for a transend wifi sd card, should be interesting.
  • PEI film for printing on, a better than tape alternative if you dont mind leving the heatbed on for quick prints. mcmasters seems to be the cheepest sofar for a 1/16 th sheet. amazon sells too.
  • printing on bare glass from my experiance so far is not a fun i recommend unless you want to spend 1kg worth of pla.
  • Blender works great for 3d printers , i’ll cover some basics here later or at the very least post some links

 640x480-IMG_0234

messy room

800x600-IMG_0236

just finished putting new spool into the unit ready to start the fun.

wasted pla strings

well theres about 141 deg difference between the temperature needed from the hotend and bed for this fluorescent filament to make it stick to glass on the first layer, i havnt gotten much further than that without glue yet.

Things To Watch for while printing

  • some things to watch for the y axis belts can get misaligned by being off a few teeth on a belts between the x carridge and the double y drive axle and it will no longer hit the endstop when homing or as free when moving it but it is very easy to miss untill you’ve cranked your homing feedrates up haha. also the y axis bearing holders are delicate so take it easy untill you get everything running smoothly.
  • curling on the base , it can happen anytime during the print from random bumps or what have it, if its an emergency to hold a corner i found hotglue to work ok , i’ve herd of using hairspray to restick fallen off parts too.
  • pva aka any white school glue from the dollar store works excelent applied in a few layers in a 1:10 ratio roughly   i’ve been getting good luck with 210-215  first layer, then down to 208 with a 78 C bed for the first layer 70 for 10 layers then off for the rest.
  • pei sheets from http://www.mcmaster.com/#8685k43/=w7bfza  if your going to get 1/16 inch sheet for 30 dollars use a business name if you live anywhere other than usa or they will not ship to regular joes’s for some reason.
  • blue painters tape is kindof a pain to put on , the best adhesion out of all of them, it wrecks the glossy look and smushes the first couple layers worth of detail if you do not adjust your gcode for the tape thickness. comes off fairly clean depending on the temp you layed down at.

http://www.thingiverse.com/tecan/designs

 

 Old Project

IMG_0132

melzi 644p board with sprinter firmware – i will upload later, under 50 dollars on ebay.

this board was a bit tricky to get working properly fuse settings and incode timing fix

avrdude -B 8 -patmega644P -c usbtiny -U lfuse:w:0xFF:m -U hfuse:
w:0xDC:m -U efuse:w:0xFD:m

also put this in the start loop somewhere to make things run properly on the 644p
MCUCR|= (1<<JTD); MCUCR|= (1<<JTD);
MCUCR|= (1<<JTD); MCUCR|= (1<<JTD);

 

the mosfet’s on the melzi boards were melting off so i used an unused io pin from the many extra and attached this 4 mosfet beast to pwm the heatbed to get er working good heh.

IMG_0176

One Response to “3D Printing”

  1. st moose says:

    can you share your repetier host settings for the duo, if you have them or know where they can be found?

    Are there settings that need to be done from the menu on the printer? I flashed the firmware on my duo but didnt know if any of the settings needed to be set so I want back to the original firmware 🙁

    Would like to go to repetier host if i could find a good how-to

    thanks

Your Reply