Saturday, September 4, 2010

Buying some more components

I've ordered some more parts for my mendel. The hybrid thermal barrier that reifsnyderb is selling seemed to be better than the regular nozzle, so I ordered one from him together with a barrel and nozzle. I hope I made the right choice on that one, as it is more expensive than the 12€ default one mendel-parts is selling.

I've also asked if it will be possible to control a heated bed with the generation 6 electronics. It seems that there will come an addon to make this possible in the future, which would also require new firmware. I decided not to wait for the addon, as the electronics themselves are not even released.

Scheme for the thermostat
(Click to enlarge)
I searched for a cheap thermostat and found one I could make myself. Unfortunately international shipping was expensive, so I had to find an other seller of the components. I have no idea how these electronics work, but as it was only 10$ for the components and 4$ shipping at, I decided to try and make it. You can see the scheme in the picture on the right. I made it a little easyer to read and added the values of the components on the scheme. In case you want to try to make one too, I have listed everything I bought in the table below. There are cheaper alternatives on their site for some of these, like the trimpot, but I decided to go for these anyway. I'll make a new post telling whether it worked or not once I have everything assembled. As testing it requires building the whole machine, this might take a while.

CERM5K5k 1/2W Vert. Square Cermet Pot1,311,3
TL431CLPTL431CLP Program Precision Reference0,3510,35
LM358NLM358N - Low Power Dual Op Amp0,2510,25
LED3GGreen 3mm Round LED0,110,1
2SA10152SA1015 PNP General Purpose Transistor0,0510,05
1N41481N4148 100V 200mA General Purpose Diode0,220,4
1N40021N4002 100V 1A General Purpose Diode0,0520,1
1N9641N964 13V 400mW Zener Diode0,110,1
R010KMF10kohm 1/4W 1% Metal Film Resistor (10)0,210,2
R0047MMF4.7Mohm 1/4W 1% Metal Film Resistor (10)0,210,2
R0012KMF1.2kohm 1/4W 1% Metal Film Resistor (10)0,210,2
R001KMF1kohm 1/4W 1% Metal Film Resistor (10)0,210,2
R033R1W33ohm 1W 5% Carbon Film Resistor (10)0,410,4
C010UC0.01uF 50V Ceramic Capacitor0,0510,05
C470U16E470uF 16V Radial Electrolytic Capacitor0,1210,12
ICS88 Pin IC Socket0,0410,04
LM35DZLM35DZ - Precision C. Temp Sensor1,9511,95
JQC-21FF-12SPDT 12V 10A PCB Relay1,1511,15
ROCKERRNDBL10Black SPST Round Rocket Switch0,410,4
HEADS88 Pin .100 Straight Male Headers0,710,7
PROTO777Prototyping Board - 7771,511,5
DCCHM52.5mm PC Mount Male0,210,2

At this moment I've spend a little over 500€ on components and shipping costs. I still have to buy the electronics, motors and some smaller parts. I think the total costs will be just below 800€, including the heated bed. It's a little more expensive then the laser cut Mendel from BotMill, but a lot cheaper then their unassembled Mendel. So it was worth looking around for beter deals.

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