120V Heatbed
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About
- OSE Reasons for using a nichrome 120V bed are scalability and lower cost for large beds.
- Reason for DIY nichrome beds is clear for larger beds on the basis of cost.
- Sound design is required a safe method:
- Do not use parts that melt at low temperature. Thus, use Nichrome C wire and braided fiberglass insulation.
- For connection, use high temp 200C wire, and simply wind them around each other. But wait... How to Connect Wire to Nichrome Heaters.
- Metal, glass, ceramic have been used successfully as heated beds.
OSE Build
Sourcing
Bed Plate
It is interesting to observe the performance of ceramics for heated beds. If heating time is acceptable, this could work.
Aluminum
- All with hefty shipping - 6" $3- [4]
- 12" $20 with ship for 1 [5], 8x16 $24 [6], 8x8 $13 [7] -
- 24" $43 [8]. $10 per 12" bed, or $5 per 8" bed
- McMaster stock - $13 + SH for 8" - [9]
Steel
- This would be interesting to CNC torch on a waterbed from 8" stock - or just cut with abrasive metal cutoff. Steel is under $1/lb - with a 1 square foot sheet weighing $5. So $5 is the baseline cost for 12" beds.
- If steel is torched, this should be done with water cooling to address warping
- Baseline cost is $5 vs. $10 for aluminum.
Tile
- Tile is a winner in terms of cost at $1/sf. 77 cents at 0.29" thick - [10].
- Granite - $2.50 - [11]
- Polished ceramic tile 69 cents - [12]
- Marble - 0.4" thick - [13]
- Porcelain - $1 - 9/32" thick - [14]
- 8x8 inch quarry tile, 1/2" thick - $1 - [15]
- 1/2" slate - $1.29 [16]
- 12x24 tile exists - [17]
- 36x36" tile exists - [18]. $22 but MOQ of 100.
- 2 3'x3' tiles for $100 - [19]
Pad
- Ultimaker beds are 500W - - [20]
- 8" bed on amazon is $84. [21]
- 8" bed on Aliexpress is $45 - [22]
- Expensive 12" on amazon - [23]
- Silicone rubber sheet - to 450F - [24] - $6/sf
- 10x10" heatbed aliexpress 500W - $10 - [25]
- 200W 8x8, $13 - [26]
Silicone Rubber Sheet
Double Sided Tape
- $3/sf - [29]
Single Sided Tape
- Kapton tape, 4"x100ft - $25 - [30]
- Enough for 300 small beds (4"), or 33 12" beds.
Coated Nichrome Wire
- Need 30 Ohms of wire, about 10' long
- See Nichrome Wire
Uncoated Nichrome Wire
- Need 30 Ohm resistance for the length of wire at 120V to get 480W, for P=IV, V=IR, I=V/R -> P=V^2/R = 120^2/30 according to Electrical Power Calculator.
High Temp Nichrome in Fiberglass
- Claim of 1200C - [31]
Sleeving
- 20 cents/foot, 1/16" ID - [32]. Specifically - 31 cents/foot 12 feet for May 2019 build of 120V hotbed. [33]
- Wire sleeving - [34] - 15 cents/foot for 16 gauge.
Rope Heater
- Up to 500C - [35]. Description: helical winding around core material, then insulating sleeve.
Helical Nichrome Coil
- Can be stretched - [36]
Carbon Fiber
- Carbon fiber is also used as a heating wire - [37]. Interesting. But it appears it can only do 15W/meter? Why is it limited? Limitation appears to be encapsulating materials - [38]
Example of a DIY Nichrome Heater
- Idea is to wind Nichrome around an inner core, as otherwise, the heater element gets too long. That is just a practical consideration for these types of heaters if running high voltage.
- Here is 31 ga and 19 feet - for 90W - at 115V. [39]
- Here is another at 12V, with 16 gauge - 10' long, going up only to 225C. [40]
.
Derivative for OSE + Calculations
- 31 ga, 19 feet long above
- Power to bring 31 ga up to 2000F is under 4A - so with full 500W, 31 ga wire would probably blow up. [41]. Need to go thicker to handle the power.
- See Electronics Stack Exchange - [42]
Links
- This heat bed is used in D3D v19.04 and later versions of the OSE 3D Printer. See D3D Genealogy.
- Insulated Heatbed
- Hackaday article - [43]