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 futurlec.com, 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.

code	description	cost	amount	total
CERM5K	5k 1/2W Vert. Square Cermet Pot	1,3	1	1,3
TL431CLP	TL431CLP Program Precision Reference	0,35	1	0,35
LM358N	LM358N - Low Power Dual Op Amp	0,25	1	0,25
LED3G	Green 3mm Round LED	0,1	1	0,1
2SA1015	2SA1015 PNP General Purpose Transistor	0,05	1	0,05
1N4148	1N4148 100V 200mA General Purpose Diode	0,2	2	0,4
1N4002	1N4002 100V 1A General Purpose Diode	0,05	2	0,1
1N964	1N964 13V 400mW Zener Diode	0,1	1	0,1
R010KMF	10kohm 1/4W 1% Metal Film Resistor (10)	0,2	1	0,2
R0047MMF	4.7Mohm 1/4W 1% Metal Film Resistor (10)	0,2	1	0,2
R0012KMF	1.2kohm 1/4W 1% Metal Film Resistor (10)	0,2	1	0,2
R001KMF	1kohm 1/4W 1% Metal Film Resistor (10)	0,2	1	0,2
R033R1W	33ohm 1W 5% Carbon Film Resistor (10)	0,4	1	0,4
C010UC	0.01uF 50V Ceramic Capacitor	0,05	1	0,05
C470U16E	470uF 16V Radial Electrolytic Capacitor	0,12	1	0,12
ICS8	8 Pin IC Socket	0,04	1	0,04
LM35DZ	LM35DZ - Precision C. Temp Sensor	1,95	1	1,95
JQC-21FF-12	SPDT 12V 10A PCB Relay	1,15	1	1,15
ROCKERRNDBL10	Black SPST Round Rocket Switch	0,4	1	0,4
HEADS8	8 Pin .100 Straight Male Headers	0,7	1	0,7
PROTO777	Prototyping Board - 777	1,5	1	1,5
DCCHM5	2.5mm PC Mount Male	0,2	1	0,2
				9,96

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.