Magnetic Stirrer Hot Plate Method

This procedure is a general guideline to help the customers process their printed VisJet® M2 Cast and VisJet® Wax Jewel Red parts with VSWR. Your results may vary slightly from the below procedure. Before proceeding with this method, confirm you have the following items in place. Also, make sure to perform this procedure in a well ventilated room or under a ventilation hood following all local safety procedures and regulations.

 

Items Needed:

  • Magnetic hotplate stirrer
  • Silicone net or a 3D printed Acrylate basket
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Note: A scalable .stl basket file can be found here: Acrylate Circular Basket.STL. This .stl file can be sized to fit your glass container using the 3DSprint. This .stl file is recommended to be printed on a Acrylate printer only. Do not print this .stl file using VisiJet® M2 Cast or Wax Jewel Red material.

  • Borosilicate glass (Pyrex) container with lid/cover.
  • Safety goggles
  • Nylon hold-down netting and wire or cord or plastic rods for hanging parts
  • Nitrile gloves
  • VisiJet Support Wax Remover (VSWR)

 

 

  1. Confirm that there is a clean build plate that has been placed in the freezer for a minimum of 15 minutes prior to step 2.
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NOTE: For small delicate parts, it is recommended to use the cold plate method to remove build parts off the build plate.

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CAUTION: WAX PARTS ARE VERY DELICATE AND MAY CRACK IF LEFT IN THE FREEZER FOR AN EXTENDED PERIOD OF TIME. 

 

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  1. Place the build platform on top of the cold blank build plate as shown. Keep freezer door open.

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  1. Within a couple of minutes, you will hear crackling sounds. This is the sound of a parts separating from the build plate. Carefully touch each part to confirm the build part has separated from the build plate. Larger pieces will take a bit longer than smaller ones. Remove build plate from freezer when all parts have released, and allow to warm to room temperature.

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  1. Put on safety goggles, and a pair of Nitrile gloves for the remainder of this procedure.
  2. Turn on your magnetic stirrer hot plate to 95° F (35°C). If your hot plate does not have an exact temperature setting, then use a thermometer. Adjust the heat dial until 95° F (35°C) is achieved.
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Caution: Parts will lose detail/melt if cleaning at temperatures exceeding 95° F ( 35°C).

  1. Fill an approved glass container with VisiJet Support Wax Remover VSWR. Place on hot plate and cover with the lid to avoid evaporation. 
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NOTE: As soon as the first part touches the VSWR, you will start to create an VSWR and Wax mixture. At some point this will become saturated depending on how many parts and how much support is on them. When it seems like the parts are taking too long to process, replenish the container with fresh VSWR.

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Note.png NOTE: Confirm part(s) have reached room temperature from freezer before placing in basket. Frozen/cold part(s) that are processed will crack due to thermal shock.
  1. The density of the wax parts is less than the density of the VSWR, so the parts will float and move around uncontrollably if not constrained. This may result in damaged parts and incomplete support wax removal. Some soft plastic netting or mesh can be used to keep the parts submerged. Thin flexible wire, plastic rods, or cord work best for rings and objects with holes. Mounting holes for parts can be made with a very fine tip soldering iron. Take care to avoid accidentally melting the part material. One could also use a sharp tool to chip away a hole, but we do not recommend this technique as it often breaks the printed part into pieces.
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  1. Carefully suspend desired part(s) inside the basket. Do not double stack parts.
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  1. Remove the lid from the container. Gently lower the basket in the container. Confirm parts are completely submerged with enough solvent above to cover the entire part if and when it floats upward against the restraint. What is pictured is just one example of the many ways to suspend parts.

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  1. Turn on stirrer to a low/medium setting (100-200 RPM) so that there is a nice smooth circulation in the container. If VSWR is splashing out of the container, turn your settings down.
  2. Replace lid facing upside down on top of basket. This will help reduce evaporation

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  1. Observe your part every 5 minutes to see the progress of the support material dissolving.
  2. The lid was removed from the top of the basket after 8 minutes. You can clearly see the support material dissolving away.

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Note.png Note: Depending on geometry of part(s), saturation of wax in solvent (cloudy appearance) and agitation, results will vary moderately on the amount of time the support wax is removed from the build part.

 

  1. Once your part(s) looks visually free of support material, turn stirrer off and remove basket.

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  1. Place the basket into a 2nd warm VSWR bath 77-86°F (25-30°C) to remove any residual support material off part. Swirl the basket around manually for 10-20 seconds.
  2. Place part(s) into a warm plain water bath 77-86°F (25-30°C) to remove the slightly oily VSWR from part. Swirl part around manually for about 60 seconds or until all VSWR is removed.
  3. Remove basket and place on dry paper towels.
  4. Carefully remove part(s) from basket and allow them to air dry. Parts are very delicate, so handle with care.
  5. A finished ring is shown below. As you can see there is a white coloration. This is a result of slight etching of the build wax. This will have no affect on casting.

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