Prusa Enclosure Enhancement - Concrete Slab integrated in LACK table

prusaprinters

General idea Placing a 40x40x4 concrete slab under your 3D-printer significantly reduces noise/vibration transferred to the enclosure.Placing the slab on top of the LACK table causes reduced height needed for the printer PRUSA MK3S+ with MMU2S. In this upgrade a concrete slab is integrated into the LACK table of thEnclosure V2. Noise and vibrations significantly reduced by this approach. The assembly also leaves the option to integreate a 140x140 fan (PWM) under the table for controlled enclosure ventilation.Materials:    1x concrete slab 40cm x 40cm x 4cm    8x round felt pads, glueable face, diameter ~25mm, height ~5mm    1x LACK table (or bottom LACK table of LACK enclosure V2)    4x M3x12 hexagon socket head screws    1x Multi purpose glue (e.g. UHU Allzweckkleber)Tools:    1x cardboard cutter    1x straight cutting guide     1x hexagon spanner    1x 8mm wood drill + portable electric drillSteps of Assembly:  1) Print parts:    4x FixingCorner_v00  (PETG as recommended material)    4x Clamp_v00             (PETG as recommended material)    1x FanFixation_top_v00    1x FanFixation_center_v00    1x FanFixation_bottom_v00 (modify center part as grid in slicer)    1x FanInletCuttingTool_v01 2) Concrete-slab-holder assembly    - assemble the parts 4xFixingCorner_v00   and 4xClamp_v00       (slide in a Clamp_v00 in between two FixingCorner_v00 to connect the parts)<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/af0ace6e-899c-43f1-b173-aba6ad100a9d/img_20220108_221333_resized_20220112_020323743.jpg#%7B%22uuid%22%3A%22934a57fa-0a2c-4410-a02f-2e01ed2b70ee%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure>     3) Tabletop upper cardboard cutout for concrete-slab holder     - on the upper cardboard of the tabletop (table surface) make a centered 415mm x 415mm        square cut out.       Use the cardboard cutter and the straight cutting guide for precise cutting.     - after removing the upper tabletop cardboard (square) cutout,      cut the vertical support structure along the edges of the new cutout     - remove the vertical thin honecomb cardboard support structure from the        cutout region.    - do not remove the support structure under the remaining upper cardboard 4) Tabletop lower cardboard cutout for fan fixation    - mark the center of the lower tabletop cardboard    - drill a 8mm hole in the center    - put the pin of the tool FanInletCuttingTool_v01 through the hole    - turning the tool and guiding the cardboard cutter blade with the slot in the tool,       you can make a clean circular cutout in the lower cardboard of the tabletop    - after comleting the circular cutout, place part FanFixation_center_v00 over       the cutout, properly align the circular center and orientation and then      mark the 4 holes for the fan fixation screw domes with a pen on the cardboard    - drill 4 holes for the screw domes at the markings    - fit the part FanFixation_top_v00 into the prepared cutout, screw domes facing down 5) Assembly of FanFixation_top_v00     - fit the part FanFixation_top_v00 into the prepared cutout, screw domes facing down    - apply glue to the surface of FanFixation_top_v00 that touches the cardboard    - glue FanFixation_top_v00 into the prepared cutout    - wait for the glue to build up good adhesion  <figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/7e194d7a-a4e6-4471-8546-eedf4b889b4a/img_20220108_221602_resized_20220112_020323005.jpg#%7B%22uuid%22%3A%226a08c90a-51b0-4f60-a8a3-67bcb73d658a%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure> 6) Assembly of concrete-slab-holder    - push the pre-assembled concrete-slab-holder into the cutout from the top  <figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/b55cc781-5a06-4c1d-8e15-22876d9b3b13/img_20220108_221737_resized_20220112_015432355.jpg#%7B%22uuid%22%3A%22839ec69b-1833-4caf-b577-c6fc28c6eeb1%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure> 7) Preparation of the concrete-slab    - turn the concrete slab upside down    - place (glue) two stacked felt pads in each corner of the concrete-slab (bottom side)<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/f2149540-0cb7-4793-90b5-27f0dfe9d19d/img_20220108_222325_resized_20220112_015430921.jpg#%7B%22uuid%22%3A%22533a326f-46a5-4eb5-8996-f39191e88ac3%22%2C%22w%22%3A3840%2C%22h%22%3A2880%7D"></figure><figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/42d725db-d404-44b8-ab48-fad1776bd9bb/img_20220108_221842_resized_20220112_015431578.jpg#%7B%22uuid%22%3A%229289b49a-3782-4fc5-9d33-54d374a2d7f6%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure>    - place the felt pads ~25mm from the edges<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/1d43b218-12ce-44d3-b2a5-41c039e2892f/img_20220108_222052_resized_20220112_015429885.jpg#%7B%22uuid%22%3A%22274b8298-2249-4254-a74f-307f57004492%22%2C%22w%22%3A3840%2C%22h%22%3A2880%7D"></figure>   - turn back the slab into normal position<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/bb7025da-92c0-45cd-ba10-e8858c428b87/img_20220108_221806_resized_20220112_015431942.jpg#%7B%22uuid%22%3A%2227cc9777-04c6-44fc-8842-b191595c6610%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure> 8) Concrete-slab placement    - place the concrete-slab rotated by 45° on the tabletop<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/e831b00f-a8a2-44a2-b981-3505286d89d7/img_20220108_222513_resized_20220112_015430527.jpg#%7B%22uuid%22%3A%22c618cb94-c002-48ca-9f00-fb4f29bf95d4%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure>    - put your hand through the FanFixation cutout on the bottom of the tabletop and      slightly lift up the slab    - rotate the slab by 45° + keep supporting from below    - carefully lower the slab into the slab-holder until the felt-pads touch the bottom      (the slab needs to be supported from underneath the table, as the sides will almost       completely be hidden in the slab-holder and you will not be able to hold it this way)<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/de8dd18f-6310-4906-b2ea-349d89059c50/img_20220108_222604_resized_20220112_015427896.jpg#%7B%22uuid%22%3A%228105682e-0494-4fbe-9e78-0658fba6f377%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure>    - adjust the spacing of the slab to the side walls      (the slab must not touch the slab-holder side walls as to avoid unwanted direct       noise transmission)  <figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/736a94d6-51fe-49f1-a0d7-84f98db923e1/img_20220108_222900_resized_20220112_015427449.jpg#%7B%22uuid%22%3A%223435974f-191a-4efc-b777-59c195e4fe94%22%2C%22w%22%3A2052%2C%22h%22%3A2736%7D"></figure>9) Assembly of the FanFixation    - place FanFixation_center_v00 and FanFixation_bottom_v00 under the tabletop      and secure the parts with the four M3x12 hexagon socket head screws<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/28df740b-1431-48ae-97c5-b80034bba2b0/img_20220108_222727_resized_20220112_015428289.jpg#%7B%22uuid%22%3A%2237d08b57-ee70-4041-a3a4-e15c1f59795e%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure>    - Option Fan: Using M3x35 screws; a 140x140 fan (PWM controlled) can be mounted      between the parts FanFixation_center_v00 and FanFixation_bottom_v00 to allow       controlled ventilation of the enclosure.      (The control electronics is not covered in this documentation and might follow later.) 10) (Re-)assembly of LACK enclosure V2     - (re-)assemble your LACK enclosure V2  <figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/2d0b4261-005a-4e29-b5f5-450a88137e6c/img_20220108_231417_resized_20220112_015429072.jpg#%7B%22uuid%22%3A%225c816e42-4a8f-40e4-8522-3aa7a55a6904%22%2C%22w%22%3A2736%2C%22h%22%3A2052%7D"></figure>    - place 3D-printer on concrete slab    - enjoy the silence ;-)<figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.prusaprinters.org/media/prints/117372/rich_content/7783bc78-2af9-4374-86d7-a776277c5275/img_20220109_005211_resized_20220112_015428691.jpg#%7B%22uuid%22%3A%22f26024f8-2a0d-4001-8e0a-9896dba6fd94%22%2C%22w%22%3A2052%2C%22h%22%3A2736%7D"></figure>

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